试了一下/usr/local/bin/obsolete/test_rga-video.sh的这个例子，但是显示没有rgaconvert：
firefly@firefly:~$ gst-launch-1.0 filesrc location=/usr/local/test.mp4 ! qtdemux ! queue ! h264parse ! mppvideodec ! \
rgaconvert output-io-mode=dmabuf-import capture-io-mode=dmabuf vpu-stride=true ! \ "video/x-raw,format=NV12, width=1920,height=1080" ! rkximagesink
librga:RGA_GET_VERSION:3.02,3.020000
ctx=0x558929b110,ctx->rgaFd=3
Rga built version:version:+2017-09-28 10:12:42
WARNING: erroneous pipeline: no element “rgaconvert”
请问rgaconvert怎么安装呢？